feat: Use async faucet transactions and support wait/reload

[alex-stone]

What changed? Why?

This makes it so that our faucet transactions will be created on the server-side without waiting for confirmation and then will be able to be waited-on / polled from the SDK.

This allows us to have more stable faucet implementations (since there are fewer persistent connections across multiple services / clients) and will return a resource that can be more useful on the SDK side of things.

How was this tested?

ts-node

> import { Coinbase, Wallet } from "./src/index";
> Coinbase.configureFromJson({ filePath: "..." });

> const wallet = await Wallet.create();

> const faucetTx = await wallet.faucet();

> await faucetTx.wait();

Qualified Impact

This makes it so that when you call wallet.faucet() or address.faucet() it returns a faucet transaction that is not necessarily confirmed yet.